I suspect it is because most fantasy writers are geeks. Self-included. And what do geeks eat? Twinkies, Doritos, and Lunchables. Self not included. Oh, and they also feed on pizza, various frozen, mechanically-extruded food by-products that must be heated up in the microwave (note: the real reason such foods must be heated up in the microwave isn’t to make them warm, its to kill off the bacterias and various poisons that naturally congregate in such materials), Slushees, and vast amounts of candy.
This geek diet means that when a geek fantasy writer is writing his or her (note: see how modern I’m being, including the style-killing, deadweight phrase “his or her”?; applause, please) fantasy trilogy (note: or, in the case of Robert Jordan mimics, never-ending story of interminable and eternal jaw-dropping, mind-numbing length) and the writer arrives at a scene involving food, they go blank.
“Uh, what do elves or dwarves or assassins or firemages or dragonmages or farm boys-destined-to-save-the-world-by-suddenly-manifesting-illogically-amazing-mad-fighting-skills eat?”
Fantasy geek writer’s brain starts to heat up as his RAM tries to access suitable eating experiences stored in the files of his subconscious.
Cold pepperoni pizza with suspicious mottling of grey-green? negative/goto/next…
This feedback loop that occurs in many fantasy writers’ minds is actually the real reason for most unexplained cases of spontaneous combustion and/or basement fires.
Which brings me to vegetable soup, of course. If you had a big pot of vegetable soup handy when one of those spontaneous combustion cases initiated, you could just dump it over the guy (or gal) and save him (or her) for another day of writing deathless prose such as:
The firedragonzombie mage waved his (or her) wand in a really cool sort of way and shouted an amazing spell that caused a fireball (or bolt of ice or _____) to hit his (or her) opponent for minus 12 hit points.
No, that is not lifted from an existing book (not that I know of; though, I might’ve gotten lucky). I’m not that snarky.
Vegetable soup? Oh, yes. Due to my personal health inclinations, I just finished putting together an enormous pot of vegetable soup. It is simmering on the stove as I type. Contents: carrots, celery, fennel, beets, cauliflower, potato, a huge bunch of fresh dill, green beans, Brussels sprouts, the juice of one lemon, onion, salt, Wolfgang Puck’s organic chicken broth (his face on the box seemed to be sneering at me while I cooked), 16 ounces of coconut milk (thank you Walmart for, oddly enough, selling better quality coconut milk than all the other grocery stores around here), salt, and various curry-oriented spices.
Simmer for several hours, blend with a stick blender, freeze into portion-appropriate bags, consume at leisure over the next week.
If the general population of geek fantasy writers out there would adopt this simple habit of making their own vegetable soup, I’m convinced it would alter the face of fantasy novels for years to come.